Welcome to Zhoushan Junhui Plastic Machinery Co., Ltd.! We are specialized in manufacturing injection molding machine screw series,injection molding machine barrel series,injection machine special screw series,extruder screw barrel,injection molding machine barrel screw fittings,Colin column series,Cone double flat double barrel. Our products include Nitride screw, PTA+Nitride screw, Plating screw, PTA+Plating screw, PTA nitride + plating, JH-S25 quenching screw, JH-S30 quenching screw, JH-S50 quenching screw, JH-S65 quenching, JH-S1 plating, JH-S1 coating, Sintered screw, Nitride cylinder, JH-B35 iron base barrel, JH-B50 nickel base cylinder, JH-B60 nickel base + tungsten carbide barrel, Special non-sintered barrel, Junhui LED light screw, Junhui PC light guide plate, Junhui PET special screw, Junhui PLA Biotech Screw, Junhui silica gel (liquid silicone screw), Junhui fast food box screw, Junhui micro foaming screw, Junhui rubber extrusion screw, Flat double cone twin screw, Extrusion barrel, Shooter nozzle connector, Plastic head, ring, meson, Colin column screw series, Corinthian nut, Cone double flat double barrel. Screw diameter from Φ16-Φ280 Effective length of screw: 810mm~6500mm Surface roughness: Ra0.4um Screw straightness: 0.02mm Hard chrome plated hardness after nitriding: ≥950HV Chrome plating thickness: 0.03-0.05mm Double alloy hardness: HRC55-62 Basic parameters: technical parameter: Quenching and tempering hardness: HB260-290 Nitriding hardness: HV950-1050 Nitrided layer depth: 0.4-0.7mm Nitriding brittleness: ≤ one level Surface roughness: Ra0.4 Screw straightness: 0.015mm Surface chrome plating hardness after nitriding: ≥900HV Chrome plating thickness: 0.05-0.10mm Double alloy hardness: HRC56-65 Double alloy depth: 0.8-2.0mm Materials and processes: High quality 38CrMoAlA, SKD61; 40Cr; 42CrMo, 304 stainless steel and other materials, high quality stainless steel, high quality powder metallurgy materials Cold, hot spray hard metal process, advanced nitriding process, corrosion resistant, wear resistant bimetal spraying process. product type: Screw diameter from Φ16-Φ280 Effective length of screw: 810mm~6500mm Surface roughness: Ra0.4um Screw straightness: 0.02mm Hard chrome plated hardness after nitriding: ≥950HV Chrome plating thickness: 0.03-0.05mm Double alloy hardness: HRC55-62